Sword Saint: Swordsmanship maxes out, and become able to draw Raid, the Dragon Sword.
Saber was born with the magical energy of a dragon, shown by the "Pendragon" name, as Uther ordered Merlin to grant his successor the factor of the dragon (竜の因子, ryū no inshi?).[1][7] She is the holder of the Element of the Red Dragon who carries the blood and very magical power of a phantasm in a human body, granting her a heart and unique Magic Circuits.
this means saber can not be harmed by any dragon like artifact and is immune to it and in contrary becomes stronger in the presence of those artifact.this is how she also got the title dragon slayer or slayer of king of mythical creature.
Magic resistance: No curses, debuffs, or buffs can affect him
Fire avoidance: 80% reduction from fire damage
Wind absorption: 80% of wind magic is absorbed
Earth resistance: Earth magic have 80% reduced effect on him
Water reflection: 80% water magic is reflected
Darkness immunity: 80% of darkness magic is nullified
Light sharing: 80% light magic is shared to another target
Magic Resistance: A Artoria boasts the highest rank of resistance to magic amongst the Servants. She is capable of completely neutralising grand sorceries involving any kind of magic magic arrays and instant contracts. Such is the extraordinary rank of Artoria’s Magic Resistance, sufficient to shake the very foundation of the Servant System. If the opponent is someone who attacks with sorcery, Artoria will charge without fear and determine the outcome of the battle with a slash. her magic resist is so strong that she was able to survive gae bolg which has the abity of manupulating cause and effect and time and space itself.
Gáe Bolg: Barbed Spear that Pierces with Death (刺し穿つ死棘の槍, Sashi Ugatsu Shitoge no Yari?, also translated as Spear of Impaling Barbed Death) is an attack focused on a single target, created by Lancer to suit his own style, that strikes a fatal blow that always pierces the opponent's heart and ruins their body from within with its thousand iron thorns. It literally freezes the mana in the air, and it can easily be perceived as a sure-kill technique by all those around simply from being charged with magical energy. Once Gáe Bolg's name has been called, the cursed spear reverses the nature of causality, the meaning of "cause and effect" in the order of things, to make it so the cause of the "lance being thrust" comes from the effect of the "opponent's heart being pierced" by it. It determines the opponent's fate simply through its use, an always fatal move that pierces the heart with one thrust.
Blessing of Lake: Can walk on water
saber has this too
First attack immunity: The first time an attack is performed at Reinhardt, it always misses.
Preceding attack immunity: The second attack and all following attacks misses him.
even if the attack misses it the area of effect of excallibur which is about 4km radius will get him and that has enough power to destroy an extire mountain in one strike and is an divine attack with to elemental type so all of his elemental/magic immunity will not work against this attack.
Blessing of the Phoenix: Upon death, he is granted a "continue?" once.
Avalon Rank: EX Type: Bound Field Maximum Targets: 1 Person The sheath of Excalibur, a Noble Phantasm with its origin in the Fairyland Avalon where King Arthur rests. The wielder will heal from any wound, and the aging process will cease making the target completely immortal. Unleashing the true name of Avalon will deploy a Bound Field that provides the unbreakable defence(its defence is so strong that even ea an anti galaxy noble phantasm could not break it https://www.youtube.com/watch?v=OWE7wLajbwU).Its existence is equivalent to Divine miracle which only gods uses.
And in skill he can fight with Satella in seemly endless battle who from LN feat should be around Multi-Continent.
so saber fought and beat gilgamesh multiple times who is multi galaxy level.